2017年4月，***主席在与美国总统特朗普举行会晤时指出，“我们有一千条理由把中美关系搞好，没有一条理由把中美关系搞坏”。重申合作是中美两国唯一正确的选择。这是因为（  ）

①和平与发展是当今世界主题

②经济全球化是当今世界的基本特征之一

③中美两国都是联合国创始国④中美两国都是发达国家，需加强南北对话

   Mr Smith 1from London. Now he is in China. He is 2 .He teaches 3 a middle school. He works very hard. His students like 4 very much. He can 5 a little Chinese . His students often teaches him Chinese 6 Sundays. Mr Smith likes playing football . He often plays football 7 his students.
   Mr Smith8  a son. His name is Jack. He is student. He studies in a middle school. He goes to school  9 bike everyday. He gets back home at four in the afternoon. He likes 10 TV in the evening.

函数f(x)＝log₅(x－1)的零点是(  )

一战前，意大利加入到德奥阵营；一战爆发后，意大利却在英国的利诱下背叛了他的盟友，宣布对奥作战。意大利的前后变化，充分说明（    ）